I’m developing a package called som
that depends on the package grid
.
There is a version of grid
on Hackage, but I need to use a newer version.
I’ve built this newer version of grid
, and the correct version shows up:
$ nix-env -f "<nixpkgs>" -qaP -A haskellPackages.grid
haskellPackages.grid grid-7.8.14
Here’s the shell.nix in my som
directory.
$ cat shell.nix
(import ./. {}).env
When I try to start a nx shell in the som
directory, I get an error:
$ nix-shell
these derivations will be built:
/nix/store/s10dijmq41lny75kgxzpq37xvijba484-grid-7.8.14.drv
/nix/store/cily89yd9gr2dljlvshld12sgpb9c4si-ghc-8.6.4-with-packages.drv
building '/nix/store/s10dijmq41lny75kgxzpq37xvijba484-grid-7.8.14.drv'...
setupCompilerEnvironmentPhase
Build with /nix/store/gvshp9yvc6gql09r3cyryj2zgsnfk6br-ghc-8.6.4.
unpacking sources
unpacking source archive /nix/store/rpr2cz3yxwc7ccd410x775mig57xyqdq-grid
source root is grid
patching sources
compileBuildDriverPhase
setupCompileFlags: -package-db=/build/setup-package.conf.d -j1 -threaded
Loaded package environment from /build/grid/.ghc.environment.x86_64-linux-8.6.4
ghc: can't find a package database at /home/amy/.cabal/store/ghc-8.6.4/package.db
builder for '/nix/store/s10dijmq41lny75kgxzpq37xvijba484-grid-7.8.14.drv' failed with exit code 1
cannot build derivation '/nix/store/cily89yd9gr2dljlvshld12sgpb9c4si-ghc-8.6.4-with-packages.drv': 1 dependencies couldn't be built
error: build of '/nix/store/cily89yd9gr2dljlvshld12sgpb9c4si-ghc-8.6.4-with-packages.drv' failed
I notice the message ghc: can't find a package database at /home/amy/.cabal/store/ghc-8.6.4/package.db
. That directory does exist, but apparently it doesn’t have any packages.
$ ghc-pkg list --package-db=/home/amy/.cabal/store/ghc-8.6.4/package.db
/home/amy/.cabal/store/ghc-8.6.4/package.db
(no packages)
What am I doing wrong?
$ ghc --version
The Glorious Glasgow Haskell Compilation System, version 8.6.4
Here’s my cabal file
$ cat som.cabal
cabal-version: >=1.10
name: som
version: 10.1.11
synopsis: Self-Organising Maps
-- description:
homepage: https://github.com/mhwombat/som
bug-reports: https://github.com/mhwombat/som/issues
license: BSD3
license-file: LICENSE
author: Amy de Buitléir
maintainer: amy@nualeargais.ie
copyright: 2012-2019 Amy de Buitléir
category: Math
build-type: Simple
extra-source-files: ChangeLog.md, README.md
library
exposed-modules:
Data.Datamining.Clustering.Classifier
Data.Datamining.Clustering.DSOM
Data.Datamining.Clustering.DSOMInternal
Data.Datamining.Clustering.SGM
Data.Datamining.Clustering.SGMInternal
Data.Datamining.Clustering.SGM4
Data.Datamining.Clustering.SGM4Internal
Data.Datamining.Clustering.SGM6
Data.Datamining.Clustering.SGM6Internal
Data.Datamining.Clustering.SOM
Data.Datamining.Clustering.SOMInternal
Data.Datamining.Pattern
other-modules: Paths_som
hs-source-dirs: src
ghc-options: -Wall
build-depends:
base >=4.7 && <5
, containers ==0.5.* || ==0.6.*
, deepseq ==1.4.*
, grid >=7.8.14 && <7.9
default-language: Haskell2010
test-suite som-test
type: exitcode-stdio-1.0
main-is: Spec.hs
other-modules:
Data.Datamining.Clustering.DSOMQC
Data.Datamining.Clustering.SGMQC
Data.Datamining.Clustering.SGM4QC
Data.Datamining.Clustering.SGM6QC
Data.Datamining.Clustering.SOMQC
Data.Datamining.PatternQC
Paths_som
hs-source-dirs:
test
ghc-options: -threaded -rtsopts -with-rtsopts=-N -Wall
build-depends:
QuickCheck
, base >=4.6 && <5
, containers
, deepseq
, grid
, random
, som
, test-framework
, test-framework-quickcheck2
default-language: Haskell2010